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Dear Lennard,
Can I adjust a Shimano mountain bike front triple-trigger shifter and front derailleur to work on a double crank?
-Steve

Dear Steve,Yes you can, as long as you use a mountain front derailleur. If you were to use a road double front derailleur, the throw would be different and it wouldn’t work.

I have set up a 2 X 9 system this way with Shimano MTB derailleurs. I recommend using the first and second clicks to make the chainring shifts, not the second and third clicks. In other words, shorten the cable so the derailleur moves immediately from the smaller chainring when you push the lever.
-Lennard

Zinn’s regular column is devoted to addressing readers’ technical questions about bikes, their care and feeding and how we as riders can use them as comfortably and efficiently as possible. Readers can send brief technical questions directly to Zinn.